Check XML resource attributes

[AngheloAlf]

ZAPD will now perform more runtime checks for the attributes of each declared resource in the XMLs.

• Checks if an invalid/unknown attribute was used in a resource.
  • Examples:

  Exception occurred: ZResource::ParseXML: Fatal error while parsing 'object_spot09_obj'.
     Unexpected 'Size' attribute in resource 'Collision'.
     Aborting...
  

  Exception occurred: ZResource::ParseXML: Fatal error while parsing 'object_sd'.
     Unexpected 'Nane' attribute in resource 'Limb'.
     Aborting...
  

• Checks if a resource is missing a required/mandatory attribute.
  • Example:

  Exception occurred: ZResource::ParseXML: Fatal error while parsing 'object_gi_saw'.
         Missing required attribute 'Name' in resource 'DList'.
         Aborting...
  

• General cleanup.
• Change the internal way of ZArray to extract multiples elements. It doesn't need to create a new ZFile anymore.
• To perform the checks, each ZResource needs to register the valid attributes for each one of them.
  • To do this, 2 new methods are provided.
    • RegisterRequiredAttribute(attr): Defines a mandatory attribute. ZAPD will throw an exception if a required attribute is missing. It's value will be stored in requiredAttributes.
    • RegisterOptionalAttribute(attr, defaultValue = ""). Defines an optional attribute. Each ZResource must check if the attribute is declared or not. It's value will be stored in optionalAttributes.
  • The valid attributes should be registered in the constructor of each ZResource
  • Every ZResource will register the required the following attributes automatically:
    • Name as required.
      • If it is an inner node (for example, subnode of ZArray), then 'Name' isn't required.
    • OutName and Offset as optional.
    • Custom as non-value.
• Check if Width and Height attributes of ZTexture has only decimal digits, and throw an exception otherwise.

Related PR: #18

This PR will need a few changes in the OoT repo, since some objects are "invalid". I'll PR the needed changes soon PR 799.

[fig02]

Everything is good oot-side for this now.
This would be good to get in when possible so we can move forward with zeldaret/oot#811